This directory includes a crosswell example used in the paper 
entitled "Estimating P-wave velocity and attenuation structures using full waveform 
inversion based on a time-domain complex-valued viscoacoustic wave equation: The method"

The format for P-wave velocity and Q models are rsf format.
The detaild about rsf format can be found at http://www.ahay.org/wiki/Main_Page

The detailed infomation about the fileds are as follows:

vp.rsf  -> header file for true P-wave velocity
vp.rsf@ -> binary file for true P-wave velocity

qp.rsf  -> header file for true Q model
qp.rsf@ -> binary file for true Q model

qp_init.rsf  -> header file for inital Q model
qp_init.rsf@ -> binary file for inital Q model

vp_init.rsf  -> header file for initial velocity model
vp_init.rsf@ -> binary file for initial velocity model


## Q-FWI results using preconditioned conjugate gradient methods
qp_PCG.rsf   -> header file for Q model
qp_PCG.rsf@  -> binary file for Q model

vp_PCG.rsf   -> header file for velocity model
vp_PCG.rsf@  -> binary file for velocity model

## Simultaneous inversion results using modified L-BFGS
qp_simul.rsf  -> header file for Q model
qp_simul.rsf@ -> binary file for Q model

vp_simul.rsf  -> header file for velocity model
vp_simul.rsf@ -> binary file for velocity model
